9836121861 has 6 divisors (see below), whose sum is σ = 14207731590. Its totient is φ = 6557414568.

The previous prime is 9836121821. The next prime is 9836121899. The reversal of 9836121861 is 1681216389.

It can be written as a sum of positive squares in only one way, i.e., 5117256225 + 4718865636 = 71535^2 + 68694^2 .

It is not a de Polignac number, because 9836121861 - 2²² = 9831927557 is a prime.

It is a super-3 number, since 3×9836121861³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9836121821) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 546451206 + ... + 546451223.

It is an arithmetic number, because the mean of its divisors is an integer number (2367955265).

Almost surely, 2^9836121861 is an apocalyptic number.

It is an amenable number.

9836121861 is a deficient number, since it is larger than the sum of its proper divisors (4371609729).

9836121861 is a wasteful number, since it uses less digits than its factorization.

9836121861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1092902435 (or 1092902432 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 9836121861 is about 99177.2245074442. The cubic root of 9836121861 is about 2142.6009848981.

The spelling of 9836121861 in words is "nine billion, eight hundred thirty-six million, one hundred twenty-one thousand, eight hundred sixty-one".